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Finding the Third Proportional to 616,905 and 840,428

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Solution

The third proportional to 616,905 and 840,428 is: 1,144,940.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    616,905 : 840,428 = 840,428 : x
  2. Step 2: Convert to fraction form
    616,905/840,428 = 840,428/x
  3. Step 3: Cross multiply
    616,905x = 840,428 × 840,428
  4. Step 4: Simplify right side
    616,905x = 706,319,223,184
  5. Step 5: Solve for x
    x = 706,319,223,184/616,905
  6. Step 6: Final answer
    x = 1,144,940.02

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.